Rubber tread and method of connecting the same to shoes



July 15, 1930. w. G. RUDOLPH 1,770,671

RUBBER TREAD AND METHOD OF CONNECTING THE SAME T0 SHOES Original Filed Nov. 23. 1927 Fig.1 2 7 2.

Patented July 1930 UNHTED STATES PATENT OFFICE WILHELM GEORG RUDOLPH, 01E HANOVER, GERMANY RUBBER TREAD AND METHOD OF CONNECTING THE SAME TO SHOES Application filed November 23, 1927, Serial No. 235,384, and in Germany November 25, 1926. Renewed June 5, 1930.

Up to the present, rubber soles and heels could be fastened to shoes, by gluing them,

and the union thus secured was imperfect.-

loboots to split, as they are usually made of wood.

According to the new process, a band or strip of linen, cotton or the like is supplied with a thin celluloid plate, or rather with a 15 layer of celluloid (e. g. cellone) spread in a liquid state on the said band in a'special way. The linen or cotton band thus prepared can be attached to the contact side of rubber soles or heels, during the vulcanization or after the same, in such a manner that it will not loosen again.

'A linen band can also be joined with a thin celluloid plate or celluloid layer by gluing or laying it on the same and this composite sheet can thus be fastened to a shoe along its celluloid face. As the celluloid paste may be applied to the band of linen etc. in such a way that it only penetrates about one half of the tissue, the other side of the latter will absorb a rubber solution,

by means of which the rubber heel or sole can be glued on. v

It would not be departing from my invention to employ two celluloid plates, instead of one, one of them being either fastened in the above-mentioned manner or by means of pegs, rivets or the like. For uniting the two parts, each of which bears a celluloid plate on the side to be connected. these are closely joined with each other through some cement susceptible of combining with celluloid. In the annexed drawing an embodiment of the invention is illustrated.

Fig. 1 shows the heel of a boot or shoe with 43 a rubber heel,a celluloid plate, and a linen band.

Fig. 2 illustrates a rubber heel with a celluloid plate.

Fig. 3 shows the heel of a boot with a cel- 59 luloid plate.

Fig. 4 represents the boot heel of Fig. 3 joined with the rubber heel of Fig. 2 by means of two celluloid plates.

With reference to the drawing (Fig. 1) i the device comprises a boot heel 1 with a rubber heel 2, which is connected to boot heel 1 by means of celluloid plate 5 and a linen band 4. The rubber heel 2 is glued to the linen band 4 by means of a solvent of rubber or by an agglutinant. The rubber heel may be provided in a particular manner with a linen band or strip.

According to Figs. 2, 3 and 4 a celluloid plate 6 is fastened to the rubber heel 2 either by means of a linen band, as stated above, or by means of the pegs 3. In the same manner another celluloid plate 5 is fastened to the boot heel 1 (Fig. The two parts- (Fig. 4), are connected by means of using a suitable solvent for celluloid, such as acetone, which will enable the two celluloid plates to be united to form a coherent celluloid plate.

The celluloid plate may also be fastened by gluing it to the rubber heel, in accordance 'with the aforesaid process.

For, uniting the twoparts, the two celluloid surfaces should only be well moistened with the solvent for the celluloid and then the parts in question should be closely pressed together. After this the two celluloid plates are joined as if they were integral.

Moreover, a. celluloid plate is not always required. When using a linen band, it will suffice to smear the latter with a more or less liquid layer of dissolved celluloid. This band can be fastened to the rubber heel by means of agglutinants or by means of vulcanization, and the celluloid layer can be attached to the boot heel, as described above.

What I claim is:

1. A method of connecting a rubberportion of a shoe to a non-rubber portion thereof which consists in connecting them by means of an intermediate fabric layer containing celluloid, said intermediate layer being connected to the non-rubber portion of the shoe by celluloid cement.

2. A method of connecting the rubber portion of a shoe to a non-rubber portion thereof which consists invulcanizing to said rubber portion a layer of fabric containing celluloid, and joining the free face of said fabric la er to the non-rubber portion by means of cc loid cement.

3. As a novel article of manufacture, a shoe having a rubber portion connected to a nonrubber layer. 0 mented by means of a celluloid cement to said non-rubber portion.

4. As a novel article of manufacture, a shoe havin a rubber portion vulcanized to a face of a abric layer containing celluloid, the other face of said fabric layer being connected to the non-rubber portion by means of celluloid cement.

In testimony whereof I have aflixed my signature.

WILHELM GEORG RUDOLPH.

portion by means of an intermediate fabriccontaining celluloid and ce- 

